7 research outputs found
Comportamento da distribuição diamétrica e espacial de Eschweilera ovata (Cambess.) Miers ao longo de seis anos em um fragmento florestal no nordeste do Brasil
No full textComparison of taper functions applied to eucalypts of varying genetics in Brazil: Application and evaluation of the penalized mixed spline approach
Get PDFTaper functions have been widely used with an existing array of model forms and methods. However, comparisons of contrasting statistical methods have been more limited. This study aimed to assess contrasting statistical approaches for achieving accurate stem taper and individual tree volume predictions, with focus on the novel penalized mixed spline (PMS) approach. The approaches were tested using four different eucalyptus genetic families planted in Brazil. For comparison, the predictions of diameter outside bark (dob) and volume using a 5th degree polynomial, the polynomial of integer and fractional powers, a segmented taper function, a variable exponent taper function, and a semi-parametric PMS were conducted. Comparisons using the generalized functions of every stem taper function with genetic family as an extra random component were also conducted. Data-splitting was used to test the accuracy of each taper function. PMS and the generalized PMS were the most accurate for both dob and volume, while the generalized PMS approach displayed more stable volume predictions along the stem. The other approaches were more variable across the tree size classes examined. Overall, the study highlights the applicability of the PMS methodology for predicting tree taper and volume that warrants future assessment and application.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
Generalized stem taper and tree volume equations applied to eucalyptus of varying genetics in Brazil
Get PDFLack of generalized equations has prevailed in Brazil, since it is assumed that localized or climate-specific equations are needed. This study aimed to develop generalized stem taper and volume equations applicable to eleven eucalyptus clones and evaluate if climate variation impacts the accuracy of the estimates. A total of 693 trees evenly distributed across eleven clones at 21 sites were used for model fittings and predictive validation. The penalized mixed spline (PMS) approach was developed for predicting stem taper, and volume along the stem profile. The Schumacher and Hall (1933) equation was used to predict total tree volume, while volume ratio equations were applied to predict merchantable volume. For every fitted equation, a climatic variable on an annual basis, was included to assess the improvement in model performance. The overall results highlighted that climatic variation does not need to be accounted for in stem taper and volume modeling. All the equations displayed desirable accuracy, whereas the generalized PMS equation may be preferred when the forestry enterprise looks to furnish a range of multiple forest products. The generalized total tree volume equation, combined with the ratio equations, is highly recommended when the forestry enterprise produces a single product.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
What factors should be accounted for when developing a generalized taper function for black wattle trees?
Get PDFTaper functions have been widely used for various purposes. Several functions were developed and successfully applied; however, most of these functions fail to account for the influence of stand-level and individual-tree effects of variation on the stem profile. Hence, we aimed in this study to assess how these factors influence the stem profile of black wattle (Acacia mearnsii De Wild.) trees in southern Brazil. There is a notable necessity for developing a domestic market for black wattle solid wood. The database was composed of 218 black wattle trees at age 10 years distributed across the state of Rio Grande do Sul, Brazil. A dimensionally compatible taper equation combined with the mixed-effect modeling approach was used. Additionally, auxiliary variables were included to build a generalized taper function that explains stem form variations. In general, all variables showed a significant influence on the stem profile, except the crown ratio. The inclusion of relative spacing and tree hierarchical position in the taper function resulted in higher accuracy when estimating stem diameters and total tree volume. This study indicates that accounting for attributes at the stand and individual-tree levels may improve stem profile predictions, as well as the biological soundness of the taper function.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
Avaliação comparativa de métodos de recuperação de enclaves florestais ciliares
Get PDFDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.A preocupação com a recuperação e preservação das matas ciliares é relativamente recente no Brasil e tem sido objeto de discussões freqüentes, abordando os aspectos técnicos e de gerenciamento ambiental. Dessa forma, o objetivo deste trabalho consiste no desenvolvimento de um plano de ação com a aplicação de diferentes métodos (técnicas) para a recuperação de enclave florestal ciliar para o rio das Antas no município de Cascavel-Pr., e investigar a percepção da comunidade sobre as mudanças ocorridas na área. O estudo se justifica, pois a implantação ou recomposição de matas ciliares, bem como o seu gerenciamento, requer o emprego de métodos adequados, geralmente definidos em função de avaliações detalhadas das condições locais e da utilização dos conhecimentos científicos existentes. Para o desenvolvimento do estudo utilizou-se uma pesquisa descritiva com abordagem qualitativa-quantitativa e procedimentos técnicos da pesquisa-ação. Assim, a partir da implantação de um plano de ação, com aplicação de diferentes métodos de recuperação de enclave florestal ciliar no rio das Antas de Cascavel-Pr., constatou-se que os mesmos não apresentam grandes diferenças nos resultados, com destaque para o de regeneração natural, implantado na área 6 do projeto, o qual mostrou maior eficiência, no que se refere a densidade, freqüência relativa em relação aos indivíduos, bem como a incidência maior de indivíduos por área, situação que permite assegurar que a área estudada se encontra em ativo processo de recuperação. Pôde-se observar também que para o bom desempenho do processo de recuperação e preservação de enclave florestal ciliar desse rio, será fundamental um gerenciamento ambiental ampliado por meio do plano de ação, uma vez que será necessária a participação efetiva da comunidade local no que diz respeito ao auxílio na conservação da área. Portanto, pode-se afirmar que com a implantação do plano de ação, sob a perspectiva do processo de ação coletiva, trará um novo ponto de equilíbrio ambiental, mediante o intercâmbio de experiências entre os agricultores e entre estes e os agentes mediadores do processo de recuperação e preservação ambiental
On the use of the Weibull distribution in modeling and describing diameter distributions of clonal eucalypt stands
Get PDFWeibull distributions have been widely used to describe tree stem diameter distributions. However, there is a scarcity of studies that suggest the best Weibull formulation. The parameters of the Weibull distribution are usually predicted by either the parameter prediction method (PPM) or the parameter recovery method (PRM), although other methods have been proposed. Thus, this study aimed to evaluate the performance of eight Weibull formulations and compare methods of parameter prediction to describe diameter distributions of clonal eucalypt stands in Brazil. Data originated from remeasurements of 56 plots at ages 3, 5, and 6 years. Weibull distributions were fitted using the maximum likelihood method and evaluated in a goodness-of-fit indicators ranking. The right-truncated two-parameter formulation showed the best results and was used to evaluate the methods of parameter prediction. Stand attributes showed a strong relationship with shape and scale parameters. Regression models were developed and resulted in accurate estimates using PPM. PRM used a growth and yield system to estimate the stand attributes, followed by the moment-based method. The modified cumulative distribution function regression (CDFR) approach was also evaluated, and it presented the poorest results. Although the PPM showed excellent results, PRM is recommended in older stands with inventory because it implicitly promotes compatibility among stand attributes.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
Ecological Management Of Degraded Forest Fragments
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